Interaction of circadian phase relation of neurotransmitters with L-thyroxine, alters differently, the gonadal activity of male and female weaver bird, Ploceous phillipinus
- Author Doris Phillips-Singh
- DOI
- Country : India
- Subject : Zoology
Keywords : Male and female weaver birds, Neurotransmitters, Temporal synergism, Thyroid, Gonads
Abstract
The weaver bird is a photoperiodic sexually dimorphic species. The hyperthyroidic weaver birds administered with serotonergic and dopaminergic precursors at specific time intervals showed testicular quiescence in 8-h birds and full breeding conditions in 12-h and contrarily in females, 8-h induces ovarian development whereas 12-h leads to gonadal recrudescence. Thyroxine (T4) administration is gonadostimulatory in males and inhibitory in females. Combining the two treatments, the gonadostimulatory effect of T4 was superimposed by the inhibitory effects of 8-h relation in males while gonadostimulatory 8-h relation eliminated the inhibitory effects of T4 treatment in females. 12-h relation increased and decreased the degree of gonadal development in hyperthyroidic male and female birds respectively. Present findings demonstrate that this differential response may be due to exteroceptive and interoceptive factors related to puberty attainment.
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